Former Ireland Schools and U20s international Hanrahan completed two years with the Munster Rugby Academy before securing a development contract for the 2012/13 season.

As an academy member he first played for the Munster senior side against La Rochelle in the opening pre-season game in August 2011.

In June 2012 he played an impressive role at out-half for the Ireland Under 20 side that finished 5th in the Junior World Cup in South Africa and was nominated for Junior Player of the Year.

He then made his RaboDirect PRO12 debut against Newport Gwent Dragons in Thomond Park in September 2012, and as the youngest member of the squad was named in Munster's 38 man Heineken Cup squad for the season, going on to make his Cup debut as a replacement against Edinburgh in October at Thomond Park.

Made the move to a full senior contract at the start of the 2013/14 season for two seasons.

Hanrahan was part of the Munster A team that won the British and Irish Cup title in May 2012. From Castleisland in Co Kerry, he played his schools rugby with Rockwell College and plays his club rugby with UL Bohemians.

He opened the 2013/14 season with man of the match performances against Zebre and Glasgow Warriors, and also scored a crucial try late-on away to Perpignan in the Heineken Cup to win the game for Munster.

Kicked 10 out of 10 as Munster had their biggest win of the season in February '14 as Cardiff Blues were dispatched on a 54-13 scoreline.

Named Young Player of the Year at the 2014 Munster Rugby Awards.

Winner of the Golden Boot Award at the 2014 RaboDirect PRO12 Awards. The minimum criteria are 20 attempts at goal and an 88.71% success rate secured Hanrahan the award for the 2013/14 league.

Played in Emerging Ireland’s 2014 Nations Cup winning campaign.

In January 2015 JJ confirmed that he will leave the province to join Northampton Saints at the end of the season.

Finished the 2014/15 campaign with 26 appearances and 90 points.

Included in the Emerging Ireland squad that won the 2015 Tblisi Cup in Georgia.